1 files changed, 0 insertions, 83 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index bd210aaf7ebd..1794bf6f4dc0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1717,89 +1717,6 @@ static int __meminit init_reserve_notifier(void)
 }
 subsys_initcall(init_reserve_notifier);
 
-/*
- * Relocate a VMA downwards by shift bytes. There cannot be any VMAs between
- * this VMA and its relocated range, which will now reside at [vma->vm_start -
- * shift, vma->vm_end - shift).
- *
- * This function is almost certainly NOT what you want for anything other than
- * early executable temporary stack relocation.
- */
-int relocate_vma_down(struct vm_area_struct *vma, unsigned long shift)
-{
-	/*
-	 * The process proceeds as follows:
-	 *
-	 * 1) Use shift to calculate the new vma endpoints.
-	 * 2) Extend vma to cover both the old and new ranges.  This ensures the
-	 *    arguments passed to subsequent functions are consistent.
-	 * 3) Move vma's page tables to the new range.
-	 * 4) Free up any cleared pgd range.
-	 * 5) Shrink the vma to cover only the new range.
-	 */
-
-	struct mm_struct *mm = vma->vm_mm;
-	unsigned long old_start = vma->vm_start;
-	unsigned long old_end = vma->vm_end;
-	unsigned long length = old_end - old_start;
-	unsigned long new_start = old_start - shift;
-	unsigned long new_end = old_end - shift;
-	VMA_ITERATOR(vmi, mm, new_start);
-	VMG_STATE(vmg, mm, &vmi, new_start, old_end, 0, vma->vm_pgoff);
-	struct vm_area_struct *next;
-	struct mmu_gather tlb;
-	PAGETABLE_MOVE(pmc, vma, vma, old_start, new_start, length);
-
-	BUG_ON(new_start > new_end);
-
-	/*
-	 * ensure there are no vmas between where we want to go
-	 * and where we are
-	 */
-	if (vma != vma_next(&vmi))
-		return -EFAULT;
-
-	vma_iter_prev_range(&vmi);
-	/*
-	 * cover the whole range: [new_start, old_end)
-	 */
-	vmg.middle = vma;
-	if (vma_expand(&vmg))
-		return -ENOMEM;
-
-	/*
-	 * move the page tables downwards, on failure we rely on
-	 * process cleanup to remove whatever mess we made.
-	 */
-	pmc.for_stack = true;
-	if (length != move_page_tables(&pmc))
-		return -ENOMEM;
-
-	tlb_gather_mmu(&tlb, mm);
-	next = vma_next(&vmi);
-	if (new_end > old_start) {
-		/*
-		 * when the old and new regions overlap clear from new_end.
-		 */
-		free_pgd_range(&tlb, new_end, old_end, new_end,
-			next ? next->vm_start : USER_PGTABLES_CEILING);
-	} else {
-		/*
-		 * otherwise, clean from old_start; this is done to not touch
-		 * the address space in [new_end, old_start) some architectures
-		 * have constraints on va-space that make this illegal (IA64) -
-		 * for the others its just a little faster.
-		 */
-		free_pgd_range(&tlb, old_start, old_end, new_end,
-			next ? next->vm_start : USER_PGTABLES_CEILING);
-	}
-	tlb_finish_mmu(&tlb);
-
-	vma_prev(&vmi);
-	/* Shrink the vma to just the new range */
-	return vma_shrink(&vmi, vma, new_start, new_end, vma->vm_pgoff);
-}
-
 #ifdef CONFIG_MMU
 /*
  * Obtain a read lock on mm->mmap_lock, if the specified address is below the